Firebase Cloud Messaging in CSB

[weilies]

Greeting gurus,

i need to make a 'Show Notification' => Allow/Block effect using Firebase Cloud Messaging
here my project: https://codesandbox.io/s/csb-messaging-x-lzem4
here my sample site: https://lzem4.csb.app/
sample config from youtube

But i am not sure why i getting tons of error in console

Manifest: property 'scope' ignored. Start url should be within scope of scope URL
DevTools failed to load SourceMap: Could not parse content for https://lzem4.csb.app/node_modules/@angular/core/bundles/core.umd.js.map: Unexpected token < in JSON at position 0
DevTools failed to load SourceMap: Could not parse content for https://lzem4.csb.app/node_modules/rxjs/index.js.map: Unexpected token < in JSON at position 0
...

appreciated some helps here.

Env:

• Browser - Chrome
• OS - Chromebook v81

Thanks

[garethx]

They're not errors, just warnings and most don't relate specifically to your code but how sourcemaps are being handled within CodeSandbox itself. They're ok to ignore.

[weilies]

thanks @garethx ! but looks like the problem is with Firebase. Please share with me if you happened to know a working example to work with Firebase Cloud messaging :)